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B. 7x²-6y-3x+2y = 7x²-4y-3x
C. (3x²-7x+1)-(x²-3x+4) = 3x²-7x+1-x²+3x-4 = 2x²-4x-3
D. 2x²+5x+x²-3x+4 = 3x²+2x+4
A. 7x
B. 7x² + 9x + 2y
C. (3x²-7x+1) (x²-3x+4)
3x⁴-9x³+12x²-7x³+21x²-28x
3x⁴-16x³+33x²-28x
D.2x²+5x+x²-3x+4
3x²+2x+4
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